Each rating compares him only with players who take that role, so the four are not measured against the same field.
Even-strength offense1544 min94among all skaters at the position
Even-strength defense1544 min85among all skaters at the position
Power play258 min21among defencemen who run a power play
Penalty kill60 min53among defencemen who kill penalties · small sample
Season by season
Every season is drawn on the same scale, so bar length is comparable top to bottom. Bars left of the center line cost the team goals; bars right of it earned them.
A player's rating is his percentile among NHL defencemen — a 70 means he is better than 70% of them. It is measured from wins above replacement, the number of wins he adds compared with a player freely available to any team. See the full roster table or read how this is calculated.